I'm running out of inventory. It's maxed and I'm pretty new (couple months). I have no idea at all how players with years in game manage things. The problem is that it's putting a cap on my play. No inventory means no more space for alts. No alts means I've got no need to spend more in the shop. No more need to waste crystals on boxes getting gear for those alts. I can't even spend more on glamour if I wanted to. No way to store things.
The strategy of charging for a too-small shared bank is thus backfiring on your cash shop. Ask any first year business student about the advantages of a larger market versus charging more for a smaller market. Alts = market = money. Here's a way to get both without much extra coding.
Add general purpose bags that can be labeled. Make sure the bags can hold a full set of gear, including some swaps. The game already supports banking full bags. Voila. You've expanded inventory and improved storage management all at once. Much more alt-friendly when you can bag sets of special purpose gear, such as "Melee TR pre 10", "Range TR 10-20", etc.. People can make more alts and thus spend more on the cash shop for those alts (think tomes).